Download Physics AP/Dual Name: Period: Date: Electrostatics: 4 – Electric

Physics AP/Dual
Name:
Period:
Date:
Electrostatics: 4 – Electric Field in Uniform Electric Fields problems II
Electric Field (Plates)
𝐸𝑎𝑣𝑔 =
−∆𝑉
𝑑
Electrostatic Force
𝐹𝐸 =
𝑘𝑞1 𝑞2
𝑟2
= 𝑞𝐸
Electric Potential Energy
𝑈𝐸 =
𝐾𝑞1 𝑞2
𝑟
= 𝑞𝑉
Electric Field
𝐸=
𝐹𝐸
𝑞
I. Answer the following problems. Show all your work to get full credit.
1. A proton is accelerated from rest by the charged plates as shown. At what speed does it leave the right
hand plate?
2. A proton is traveling at a speed of 6.4 x 105 m/S when it is accelerated through a potential difference of
2000V. What is its final speed?
3. A proton leaves the left hand plate with an initial velocity of 1.1 x 107 m/s. What is the minimum
potential difference between the plates such that the proton does not reach the right hand plate?
4.Two parallel plates 4.0 ×10−2m apart have a potential difference of 1000 V. An electron is released from
the negative plate at the same instant that a proton is released from the positive plate. Which of the
following best compares their speed and kinetic energy as they strike the opposite plate?
5. Two long, parallel plates are separated by 0.028 m and have a potential difference between them of 80 V,
as shown below.
6. Point P is located midway between the plates. What is the potential difference between point P and one
of the plates?
A. 0 V
B. 40 V
C. 80 V
D. 160 V
7. An object with a charge of +4.0 ×10−18 C and a mass of 1.1×10−15 kg is held stationary by balanced
gravitational and electric forces midway between horizontal charged plates as shown.What is the applied
voltage V?
A. 16 V
B. 32 V
C. 65 V
D. 2.7×102 V
8. Which diagram shows the electric field between a pair of charged parallel plates?
Physics AP/Dual
9. What is the acceleration of a proton in a uniform 2.5×105 N C electric field as shown below?
10. In an experiment, a positively charged oil droplet weighing 6.5×10−15 N is held stationary by a vertical
electric field as shown in the diagram. If the electric field strength is 5.3×10 E 3 N C, what is the charge on
the oil droplet?
A. 1.2 ×10−18 C
B. 3. 4 ×10−11 C
C. 4.1×104 C
D. 8.2 ×1017 C
11. A proton with kinetic energy of 2.1×10−17 J is moving into a region of charged parallel plates.The proton
will be stopped momentarily in what region?
A. Region K
B. Region L
C. Region M
D. Region N
12. A moving proton has 6. 4 ×10−16 J of kinetic energy. The proton is accelerated by a potential difference
of 5 000 V between parallel plates.
13. The proton emerges from the parallel plates with what speed?
A. 8.8×105 m /s
B. 9.8×105 m/ s
C. 1.3×106 m/ s
D. 1.8×106 m /s